Hello, Sometimes when I have static charge and touch MINI2440 Ground surfaces such as standoffs or screws, it restarts automatically. Can this be prevented by some means such as proper grounding?? Did anyone has the same issue?? Thanks.
Can you hear or feel the static discharge? If you touch the board once and it restarts can you touch the board again and it doesn't restart. Or have you got a intermittent that only requires some gentle mechanical input to be made manifest? The DC plug and DC connector on the board would be my first suspects. Solution: Put it in a case, so you can't touch the earth parts of the board! Have you got other things connected to it or does this happen just with the DC supply connected up?
Thanks davef for the response. I have a serial RS232 IO board connected to it and when this happens the digital relays on the IO board turn off and the software TFT screen changes on MINI2440 does not have effect on the IO board. I have to restart and it to work properly. I am not sure if it will occur on MINI2440 in standalone mode as I did not have any way to tell if this happened. I could see it as the relays on external IO were turning off..
Are you using the plug pack that comes with the board OR an external supply? Maybe, the external supply is grounded. Can you float it? Nothing else connected to the relay board like oscilliscope probe grounds or ?
Yes, I am using the black power adapter which came with the board. No, nothing is connected to the board. This issue has been occurring for past 34 months at random intervals, generally early in the morning. Thanks.
Haven't got my board at work. Are the standoffs actually connected to PCB ground? They might be isolated from pcb ground by solder resist. Is the shell of the RS232 actually connected to ground? You could try always touching the shell, if it is grounded to the pcb ground, first.
So don't wear cloths that promote the storage of static charge. When you dump the charge into the electronics , you are moving the reference point and reverse biasing the internal semiconductors, I'm not surprised it resets. But what is a surprise is that the thing will still work, and if you continue to do this then one day it will not continue to work.
We've had some dry cold weather recently and the guy on the bench next me was trying to "reconfigure" the way he had his test gear connected together, hoping to eliminate the "belt" he was getting each time he touched a metal connector on a test cable. I got him to put on a static heel strap and now he is a happy fellow!